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How to Lay Slate Tile Diagonally

Laying slate tile on a diagonal gives a room a unique design.

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  • Time


  • Price Range

    $500 - $1,000

  • Difficulty

    Moderate to Hard


Step 1: Snap a Chalk Line

To lay tile on the diagonal, put a speed square in the corner you are starting from and snap a chalk line.

snap chalk line from corner to corner diagonally

Step 2: Cut and Dry Fit the Tiles

Cut a few tiles on the wet saw and lay them out on the floor for a dryfit. You should mix tiles from different boxes to account for the color variations.

cut and dry fit the tiles

Step 3: Apply the Thinset

Backbutter the tiles with thinset using a square-notch trowel. The slate tile thickness can vary up to 7/16" of an inch so add extra thinset if necessary to make up the difference. Hold the trowel almost vertically to get the maximum coverage of thinset.

backbutter tiles with thinset

Step 4: Set the Tiles

Place spacers between each tile (Image 1). Sponge extra thinset off the top of the tiles before it sets (Image 2).

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